NMR and NQR Studies of CeTIn₅, Ce₂TIn₈(T= Co, Rh) and URu₂Si₂under High Pressure

NMR and nuclear quadrupole resonance (NQR) are powerful methods for the microscopic study of the magnetism and superconductivity. The NMR/NQR measurements were performed under pressure P up to 3 GPa using a conventional piston and cylinder pressure cell. The application of P induces phase transitions in many strongly correlated f -electron systems. In CeRhIn 5 and Ce 2 RhIn 8 , the antiferromagnetic A F order is suppressed, and the superconductivity appears with increasing P . Our measurements show appearance of non s -wave superconductivity. In URu 2 Si 2 , the 29 Si NMR spectra show that the transition occurs from some curious ordered state at low P to the antiferromagnetic state at high P with increasing P .